Sparking plug for explosive-engines.



PATENTED SEPT. 24, 1907.

- W. DIEBEL. SPARKING PLUG FOR BXPLOSIVE ENGINES.

APPLICATION FILED JULY 13, 1906.

' WITNESSES: 44

v. E N R 0 T nnirsn STA rite ingress @FHQE WILLIAM DIEBEL, OF PHILADELPHIA, PENNSYLVANIA.

SPARKING PLUG FOR EXPLOSIVE ENGINES.

Specification of Letters Patent.

Patented Sept. 24, 1907.

Application filed July 13,1906. sum No. 326,010.

To rill 'whom it may concern:

Be it known that 1, WILLIAM DIEBEL, a citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have-invented a certain new and useful Improvement in Sparking Plugs for Explosive-Engines, of which the following is a specification My invention relates to a new and useful improvement in sparking plugs for explosive engines, and has for its object to provide an exceedingly simple and 7 effective constructionin which an explosion chamber ing of the same Within the cylinder, which would of the details of construction and combination of elements,

necessity injure the piston and cylinder.

With-these ends in view, this invention consists in hereinafter set forth and then specifically designated by the claims.

ing a part of this specification, in which Figure 1 is a bottom plan view of one form of my improved construction. thereof. Fig. 3, a bottom plan of a slightly modified form of my improvement. Fig. 4, a vertical section thereof; Fig. 5, a bottom plan of a still further modified form of my improvement. Fig. 6, a vertical section thereof. a In carrying out my invention as embodied in Figs. 1 and 2, A represents the metal body of a plug, which is adapted to receive a wrench, and B is the threaded nipple extending downward from this body by which the plug is secured in the heachoi thp cylinder in the usual manner. The nipple is hollow forming a chamher, and the body portion of the plug has an enlarged cavity 0 formed therein which serves the double purpose of increasing the capacity of the chamber so as to make a choked explosionwhich will cause the oxplod ed gases to rush past the sparking points with such violence as to clean the same of accumulated soot or oil; and the further object of this enlarged chamber is to provide sufficient space around the head I) of the central conductor E to prevent the jumping of the cur- Fig. 2, a vertical sectionrent from this head to the metal plug, as is clearly shown in Fig. 2:.

The conductor E passes through an insulating plug F of rolled mica or other suitable material andlias a series of mica insulating washers G interposed between the head D and the upper wall oithe cavity C, while around the upper portion of the central conductor E is placed .a porcelain or.other insulating block H, a

suitable jam nut I being run upon the upper threaded end of the conductor and jammed against the block H thus holding the parts in place.

.l isthe ordinary binding nutrun upon the upper end of the conductor E by which the terminal of the electric source is clamped in place.

K represents the central sparking point, which extcnds'downward from the head D flush with the lower edge of the nipple, and L is the other sparking point which is secured to the bottom edge of the nipple and extends crosswise in close proximity to the sparking point. i g

It is to be noted that no insulating material is placed around the sparking point K, and as in my improved construction none is needed on account of the cham-' ber within the nipple being of sufficient size to preclude the possibility of the jumping of the current from this point to the walls of the metal plug, and-the danger which has heretofore existed of the insulating material cracking and breaking away on account of the heat to which .it is subjected and falling into the cylinder where it will be ground into the walls of the cylinder and the piston rings, thus cutting and searring the cylinder and rings is entirely obviated.

In Figs. 3 and .4 a slightly modified form of my im provcment is shown in which the interior bore of the nipple B isoi the same diameter as the bore in the body A, making a straight cylindrical chamber of sufficient size to preclude the possibility of the current jumping from the head D or the sparking point K to the walls of the metal plug. The diameter of this construction is the same as that just described in connection with Figs. l and 2. V I

in Figs. 5 and 6 a further slight modification of my improvement is embodied, in which the body A has a double bore of different diameters, the upper portion being adapted to receive the porcelain insulator H which shoulders upon the ledge formed by the small diameter of the lower portion of the bore which constitutes the explosion chamber a, a heat insulating washer G being interposed between-the porcelain H and the ledge which covers the bottom of the porcelain and prevents an undue amount of heat being transmitted thereto This washer also serves to hold the porcelain in place even though it should become cracked orbroken. b is athreadgd collar adapted to fit over the tapered portion of the porcelain H and be threaded into the upper end oi the body A, thusing point secured to the plug. The central conductor E projects through the porcelain insulator and is secured in place by the jamnut I. In this construction the eentrelconductor and. sparking point may be removed Without the removal of the metal plug from the cylinder and the explosion chamber a is of 1 such capacity relative to the opening (1 therefrom that when an explosion takes place the gas contained within the chamber will he shot through this opening with such violence as to thoroughly clean the sparking points.

Having thus fully described my invention, what I claim as new and useful, is

. In combination, a body having a threaded upper end, the threaded lower portion hai ing a small opening therein, a sparking point extending inwardly from the wall of the lower opening, a shoulder in the body, a heatvinsulatlng vynslrer resting on the shoulder, a porcelain insulator fitting to the bore of the body and resting on the washer, said washer and porcelain insulator having coinciding apertures, and said insulation terminating at the washer, a

-WILLIA M DIEl-ZEL Witnesses .Tosiu-n C. SMITH, S. M. GALLAGHER. 

